The CAS Registry Mumber 15918-70-4 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 1,5,9,1 and 8 respectively; the second part has 2 digits, 7 and 0 respectively. Calculate Digit Verification of CAS Registry Number 15918-70: (7*1)+(6*5)+(5*9)+(4*1)+(3*8)+(2*7)+(1*0)=124 124 % 10 = 4 So 15918-70-4 is a valid CAS Registry Number.
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